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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a43ed54b93864c8f259b29d6b136eb5be90b41a0731ba61c7d422e012884f71' 
  AND token = 'TR2rLUF2wH1Arv7922RIpnIKynVaVa9axRBP0UAEUsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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