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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570d210a43b57e3316e79bd6270c73df8659636b9febe6e35731cc079ecb94fa' 
  AND token = '1l8iiPFpdb9OigbAIr31SChghXa+bKNyyAj6FMe4kVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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