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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e64fe1fd4027008a5413d8705fac81b26b335e67be585fd156df49fb0160be3' 
  AND token = '4GFE1l9jBwwZ0ioMLhsBI9c3r96/kTy89RCgLy2CK/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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