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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123ef509c179b2aa22e3fd7c5615e229ac007df2329a1fbc2bf9092ac10dba03' 
  AND token = '390Nan59zyJmFOm5IOG2xK1k/vN832RXFQg6Z+xblsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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