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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd347bc53631794a2e2780000001b6c82e50adcf2bf18c47ee9571d0b34640a1e' 
  AND token = 'oGDpI3C1PWpokMxH2mewd6Z74sB63eMKUNCbvRdPXFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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