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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd15d4128cc84baa536d387d7f0a4c6d84deb8f5977e45763c0c5c673d509f57' 
  AND token = 'HRzPD7bv59l6yjgxzjMxyYqnC68Vck+CTTT2h75VkO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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