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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186340350e619123fbbd67a93b2e9edc7863a87de1d9ce5edb0fbe036837019d' 
  AND token = 'eIhu34uD7GIT/HnOdOyGYr7n/N81XnEUjKXFoJdLgFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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