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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74fac116f0cd1fcb9f24b4759a174f1f8cd2721bde4ed377c27049d5e9d7089' 
  AND token = 'Rg5Gh5/TYeKttLA4XQmn233CBXpfIYKDsrR1siQDmp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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