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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a407bd175837fb4ad9cfa0ef0d5e17e2f78dafb17c66a6427a152e7d5f5be5' 
  AND token = 'gI+YQxtaAo5AsK0ZsAM87pyoKYEcuZfZNxbMd689vxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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