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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4784b7852ac0cc823925cbfb8c250eaa4c6384707495eb77554c5f803a14cf18' 
  AND token = '0OAyD4aZrsY6HLfRTDYi/VPkhYeiAqS2KO3dphZNoAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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