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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eefda36e6e4fc1889e74ecda09cee746aa635bdf397ac6cfb045443ff75195b0' 
  AND token = 'UQZMpHKp7i22efwVHWTfTWyt/++EFoA8IU4SHSTPXb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}