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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebd62028bee54c00b43dec5640abdd7a455b90514ea15d82f534a98732462de' 
  AND token = 'h2uaMKMail6EIdr7iamN/Iq3cuB5VWN4rdrsIHz+vZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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