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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f2b4759245296381d689ba0a186e7b13c2b7a518f39f9cb4f03b9bc4963002' 
  AND token = 'bt9oN0imd/2ByV5gnbwNWajfzWfvyN0Q4NggHrKDeM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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