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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9416a2a6cef61e353360752cc03a06382fba117117a5895185ca123d16a1a62' 
  AND token = '6C/D8UXxE9Pqc5o40jmyht6q5whRj/8S3Y9VfgSoMqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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