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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a812a880ba01b1b10c892fc3d6a683023fd958ca18d6cb8e7d6c61d3a7a08a' 
  AND token = 'Qd7mE2xHEU7Os8NRnfS9eRdRuhw2HllMjZAv6Y5P9pM=' 
  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"
    }
  }
}