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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76db43ceb144fa9cb59a3c9cd4dd8252336fdf6076c5e9e6a3717d94ab27626d' 
  AND token = 'O4XM9QUodzxs5hW3jLxO2yb1I3rcGnJvVGyc7ybFfck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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