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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c4cf036f27e37d1b8d232100daad51a5d7a219d7a0e96070f5e13c8737b2e3' 
  AND token = 'v/1OweZnsmWPt1GQp7JqGIddQZgxmI26zUV6TX6yG/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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