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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed18d4b45782c017d9b31d996555b4c9789350af359b83e56176543d67c71bdf' 
  AND token = 'nJdW0ucLs0VFeRTt2xbXQlFzDE0wJkVuD19MkyV2euo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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