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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1900def37979c0176d55fb2f85291fb3350d2962492d5ff6a434e787d2c470b2' 
  AND token = 'Dk7Cb4+b8D0Lh1yIXbPAhS32J35n6UFHxzr1hXEy9zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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