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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9595627cfc6144b1a62c7472d457963ca4f8f5b0e1b75e4ee19d6ba2e2efcf' 
  AND token = 'InPx8gU3e8ythv0El7tZ2uaHg/9e04XMzwN/9vPOdoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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