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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904e7c03a2669d3c095fb3090927982c88e05265b94a7781e6097f9212b02a59' 
  AND token = 'Gq2pfNRpuX4WsO7RTl7XmpOYPhMwws6D4p1aIK67fgc=' 
  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"
    }
  }
}