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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4e5fc75d8e67a8b6f3ca045f8fb0341f8566a9e0de4bf14765f5e19e83068a' 
  AND token = 'h4wmvfi4bhQLkihrFD+4UmMClNVxYDWIUgt/K9gXIQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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