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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c49d46f5467b34b360e651e9e6d3119716d69f5735484a585eb3c6d59d8531' 
  AND token = 'luI/yjf4ILRry/a4MC+ZaimY3kSW1ju//WY/h5fy3Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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