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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2010eed4a4c208bacd11442847f9280dc11d20aef3c788c93bd6ac9c71840a58' 
  AND token = 'P9FFCMpn9pSk8c+ZU1SUISkUugFGoDnkZTF5PN2844Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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