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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a165623bd5e47cfe1edb5d7762c0d36ed8fe1b508961422e3ac3b1476f7e5167' 
  AND token = 'Vz7NP3YN20lXomrci7g9hf/4oao86xPVAq23hk0eEuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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