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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f1a9f525befb5ec95f15c1d214c5c1b8430200f23ba4995b21b7a22c37f317' 
  AND token = '534lqmM9dVMA00Ht0tM0avNDc7S7rbpi8OXZgNYuAeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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