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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8296e65f19586adf4334e4eaf6e43eef832562287e5ded358aeb96fb8e9a7845' 
  AND token = 'KMp98DML1XKCS+Wqh2tqN5BfS2yz/tF3FUcNtTKdfP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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