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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2feac7736ccc673988d3fc1944b3e9d61282985ed365757a12ad9dae02474857' 
  AND token = '/T/UOkmgmbrH/d+2Sy9hNbJBvMlp6Bopsi0AxNdYQXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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