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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd93bca27d8d5683bee54f8e6ba4f219fe9601c5110586b2e58e83a1b9fd0b7b' 
  AND token = 'HpqQonZ3ADX59fESMOB3D+GSdxZySW5NZJKoQQ3iOfE=' 
  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"
    }
  }
}