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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704ee119d9c6fffbbe15e3d63c3c8ca99a5569e79be17ada37f66c032bb5b4dd' 
  AND token = 'V1h8rcSgu6mbWpJKN3kfMxf22VsV4u11koMjasNAmjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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