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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e612dc869664c0e5ab0387e6bf2cc09d9f44ca101490f266a2e6d9133f0e373' 
  AND token = 'SVXSxA3xx0nbhOeG5LuSfZjRV45LvElxh1Le+b81LI0=' 
  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"
    }
  }
}