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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbe7892d569899fe07f26418a966b63bd257984a7e013aaf78ad9afb270922d' 
  AND token = '3hSP4hTLjj3Okh5WQMnmffVIQLOQE1irhe/z/1EO4eQ=' 
  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"
    }
  }
}