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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c004f06ff74f3d1c6a75b18440f666eacae52ba7ae8ec396378d14f562f124' 
  AND token = 'anj9UMmEn+gMwJeVak5dgSGGOf31oID0i6xJZvseSN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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