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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f49fb394d8d6e51e76b84fb7168c856699d08dfd876545c05b82956f20dec1' 
  AND token = '+TBn6POcN8K4WiXvBC9oxkkQTfzR4E1aebO7RmNX2GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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