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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455a19b19606a2d25aadc670c52108e2e0b8b1013646e94ed9e892fe1aa7e095' 
  AND token = 'fmPO/pMexOPcPo9BPDqa8tScFDPtmMYz2my2Hfn3jD0=' 
  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"
    }
  }
}