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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bee90787812d9eb1b7f0837b36662a643d126eb90a8a56eb1e38a8b4781745' 
  AND token = 'UkF5QL4v7IeVltVi9nIBOSaCk6YvWZ2Zg9QZhZ2rpd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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