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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5740c66ea9aff0945743f00b747331a0ee57ee5da35e77ff1b55b54bf62095' 
  AND token = '0ReXWuLcONKV6k7G0Zzd5UCwdmQFe8dCIkMi1Jf18m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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