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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270799cd4a5e785a126f6e9d93e6dd9facb8955d8fed8b8778a48122e542cd50' 
  AND token = 'E4wpf2FE8uv/6df9345rmbMtsW7NXnoKNqcISK1/2DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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