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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb235891edfb7a13a2bbf2dd6beff0acb7cfe1886bde2e34f74b9efbadc4dd4' 
  AND token = 'TwNbAk/dOl30HHlglzVz0IA5BcMYaZi0y6JmcvfTKxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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