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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef759b92a0826aaec2c677e08d7f42bf9ffc18e74d6b0a6776741398e7f32dff' 
  AND token = 'xTzpN9zTBrb5YXg2jwIXdSH4CSEfmzqr/aSzCzm30Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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