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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0396bdcf79bf29d5f5ded959a5a0c9333f76ecb033eb665666307f413a5cc9cb' 
  AND token = 'unKMABfHPt5U5Y3sxM/SYph2WoP8b65e/NHylY8Kw7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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