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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39059ffaea15331b335a7c5feed8a78b74265274fbee087307e82cfd4cd8b423' 
  AND token = 'k6wrkv9oOwsd6I1AeNtKgGQO5WFXaS3yfrz9PYJWw5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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