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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be6fba8ae34422dfd71bcf4f04c2e3f20d8159db3beb5ce77c6373a7888d39a' 
  AND token = 'nI/qCpyiWNb2kDeE06aW+Z7/7SnSgKHjvFPmE+KZP3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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