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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1548c8e3a0404fb39da389260db5aa94c4fbd8f6236c0d3993aae1e0e5c8f940' 
  AND token = 'kb7face9VPYM+ZiVTsSNmGTltqBJc8Gae5++UEV5eC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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