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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914721aed99cacc1ab1a74c786f793db9379bcac9e37ed1ca00f98c22af54b8d' 
  AND token = 'WBSrQYAFyGOFXCImUxwkzsXvRKANo+VCl3+vKthAcRM=' 
  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"
    }
  }
}