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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff4eb8370400d2d03dda3184138d6623d5f7a1e63858d9b5d03b28db2b9df3d' 
  AND token = 'rG2k7DcC6WmpsdfF80s8+uAVq7WXX5S+P1ju8voVk84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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