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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fecdf243afd2f7e95fa1989ded4bfb0472d9258cb03efbb0abdad9aab74484b' 
  AND token = 'cLATISxij5paMgQsn7NYHh/NUbovNj5NAIWJgnCptYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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