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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37cb18debc2de682bebc150acc9b1b92a22d78c4f5a966e5c8089ed624702cf' 
  AND token = 'dDd1SI8sWyMmzPYzwmxbgo4ESgVWPbLtKL657I3Prd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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