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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45a85d254e4f1c30ee38d81ee157fea5c945ce313e7a58311524f45da68f20c' 
  AND token = '2J7BCWbi1zlhFddveITJ4Pu6B+pqSCxVXnEX7o99MSw=' 
  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"
    }
  }
}