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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6793a688d5574847f81aa7297a97b589dd7837ed942784e2f3668a76c1faee' 
  AND token = 'e2vLZwqAtO2+TuQPJ3vH2r9wFTM4ytRbNa8scpvXaPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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