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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fa46baf9b96ebd43d1ac261c3dc2b9deced9cee4acc8485fb4ecf1c9bd5b17' 
  AND token = '4/6XcYOVxAztDoHM3MECci3+FlHEdleIb0hVb85RHZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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