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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb0edfd095b48a731a3882d963f1ee8e6c87d4984b7579027d4567c0f81c517' 
  AND token = 'uD6PbM8gujCmCoUJ32FPSWTtFp4WwGvod0ma+zB3R9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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