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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7d77b9005b7a6faabde754434f71b3c6cf1a9264a7b61979e1f9137d7fcda7' 
  AND token = 'aOKP+kQh885hACd0Wh8O4KDLpNpq464dsHLQ+EdaUlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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