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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1393b094fc171b248705717281a176e2fe17a04114f117017053feb683e3a3' 
  AND token = 'wkC0n5pH9NEWQx8JiWVzy5KFWhF8rOTehn1I1L/3jwk=' 
  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"
    }
  }
}