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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccce9f978b104682799d19b20273bd276c3f3c47520117897bdcb79735550bf1' 
  AND token = 'tXm+PVIXrdofiRwCCTJr8kmUR+3iK1ORQHRvt+AxIr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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