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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31ca317236cc7d54d3fac9660f1ec8a0c11d35b3423d71570267943a1b19be5' 
  AND token = 'BqclB7N+tzqj9AKMFf03/P8NaYHE15wjNnIBUrFGahQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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