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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdedc9c52f31a8434ee08b3c0e523d0b80da4984c70c1ba36933c96343837c89' 
  AND token = 'XHEJFU2ogOG9KDgp9rGb9aC1keAhmmyD1njRclFZXnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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