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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4cf189121becf8b6ef4d350f0a429e981ef409ec1e9d0c75339f4ac3ec8517' 
  AND token = 'njs2uJt121NdaxqRqAZM28eE1sM1GFD8wxQpwv/k7Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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